D2331 is the CDT code for a resin-based composite restoration covering two surfaces on an anterior tooth. Anterior teeth are the front teeth: incisors and canines. This code applies when exactly two surfaces are restored with tooth-colored composite material.
Last updated June 2026 · Reviewed by the PracticeAlpha billing team
Get help with D2331 claims →Use D2331 when placing a direct resin-based composite that covers exactly two surfaces on an anterior tooth. Anterior teeth include the maxillary central and lateral incisors, canines (teeth 6-11), and the mandibular canines and incisors (teeth 22-27). Common two-surface combinations include mesial-incisal or mesial-labial.
Common clinical scenarios: An incisor with interproximal decay extending onto the incisal edge requiring a two-surface composite. A fractured anterior tooth where the restoration involves both the labial and incisal surfaces. Recurrent decay on a previously restored anterior tooth now involving an additional surface.
Do NOT use D2331 for: One-surface anterior composites (use D2330). Three or more surface anterior composites (use D2332). Any composite on a posterior tooth (use D2391 for one surface, D2392 for two surfaces). Temporary restorations (use D2940). Veneers or indirect restorations (different code series).
D2331 is strictly for anterior teeth. If the tooth number on the claim corresponds to a posterior tooth, the payer will deny it. This is one of the most common errors with anterior composite codes. Verify the tooth number before submitting.
If the chart records one surface but the claim shows two, the payer will downgrade to D2330. Document each surface involved in the clinical notes and confirm the count before coding. The surfaces must be clinically distinct and documented, not simply assumed.
Most plans limit how frequently a restoration can be placed on the same tooth. If the patient received a restoration on this tooth within the plan's lookback window, the claim will be denied. Check the patient's history and the plan rules before treatment starts.
Some payers require documentation showing why composite was placed. For anterior teeth this is usually straightforward (aesthetics and function), but the clinical note should still describe the decay or fracture and the surfaces involved. A vague note increases denial risk on audit.
Record the specific tooth number (confirming it is an anterior tooth) and each of the two surfaces restored. The surfaces documented must match the claim exactly.
A periapical x-ray or detailed clinical finding documenting the decay, fracture, or failing restoration affecting two surfaces. Anterior restorations often benefit from intraoral photos in the record.
Document the diagnosis: primary caries, recurrent decay, or fracture. Note why two surfaces were involved and that composite was the selected material. Be specific about the clinical findings.
Pre-operative photos of anterior restorations are particularly useful for substantiating the claim and responding to payer requests for additional information.
Anterior composite claims getting denied or downgraded? We identify the documentation and coding gaps causing it.
Learn about our billing servicesD2331 is the CDT code for a resin-based composite restoration involving two surfaces on an anterior tooth. It covers tooth-colored direct composite fillings on incisors and canines spanning exactly two distinct tooth surfaces.
D2330 covers a one-surface anterior composite. D2331 covers two surfaces. Both apply to anterior teeth only. The surface count is the distinguishing factor. When the restoration involves a second surface, D2331 is the correct code.
No. D2331 is for anterior teeth only. For two-surface composites on posterior teeth (premolars and molars), use D2392. Applying an anterior composite code to a posterior tooth is a coding error that leads to denials.
Common reasons include applying the code to a posterior tooth, surface count mismatch between charting and the claim, frequency limitations, and missing clinical documentation for the two surfaces restored.
Clinical notes identifying the tooth number (confirming anterior) and both surfaces restored, a radiograph or clinical exam note documenting the decay or fracture, and the diagnosis. Intraoral photos are recommended for anterior restorations.
Most plans cover anterior composite restorations as a basic service at 70 to 80 percent after the deductible. Check the patient's plan for surface limits, frequency rules, and any aesthetic-exclusion clauses that may affect coverage.
Search all 206 CDT codes in our dental coding guide.